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About one third of all U.S. adults report having ever been tested for HIV infection. The proportion is highest (>50%) among women aged 25 to 44 and lowest (<20%) among men and women aged 65 and older.
Centers for Disease Prevention and Control (CDC). QuickStats percentage of adults aged ≥18 years who had ever been tested for human immunodeficiency virus (HIV), by age group and sex — National Health Interview Survey, United States, 2007. MMWR Morb Mortal Wkly Rep 2009 Jan 30; 58:62.